BELL RINGER 9-6-07 1. 4 + (-23) = a 2. -13 + 18 = b 3. -17 + (-31) = c 4. -11 + (-11) = d 5. Y = (-12) + 15.

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Presentation transcript:

BELL RINGER (-23) = a = b (-31) = c (-11) = d 5. Y = (-12) + 15

8 th Grade Agenda Sep 4 Grade Homework Bell Ringer Notes – Subtract Integers Homework

Subtracting Integers This presentation was created following the Fair Use Guidelines for Educational Multimedia. Certain materials are included under the Fair Use exemption of the U.S. Copyright Law. Further use of these materials and this presentation is restricted.

Student Objectives I can subtract integers. I can use subtraction of integers in real life situations.

Vocabulary opposite – is the number that is the same distance from zero but in the opposite direction. 4 and –4 are opposites. additive inverse – the sum of a number and its additive inverse is 0

Subtracting Integers ADD THE OPPOSITE LEAVE-CHANGE- OPPOSITE

Now Use Adding Rules Positive + Positive = Positive Negative + Negative = Negative (add the numbers, give the answer a negative sign.) Negative + Positive or Positive + Negative – Subtract the numbers, give the answer the sign of the larger number.

Absolute Value Is the distance from zero only, does not include direction ALWAYS POSITIVE Show me examples…

Examples Example 1 4-(-7) = 4+ 7 = 11 Example – (-2) = = -21 Example – 22 = = -70 Example – (-12) = = -1

Examples Example 5 Evaluate 12-a-b for a=9 and b=-6 12 – 9 – (-6) = = = 9 Example 6 Evaluate c – a for a=9 and c=-2 -2 – 9 = = -11

8 TH GRADE HOMEWORK Subtracting Integers Worksheet